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Tremasteridae
Taxonomy
Tremasterinae was named by Sladen (1889). It is extant. It was considered monophyletic by Gale (2018).
It was reranked as the family Tremasteridae by Gale (2018).
It was assigned to Asterinidae by Sladen (1889), Hess (1972) and Smith and Tranter (1985); and to Chevronida by Gale (2018).
It was reranked as the family Tremasteridae by Gale (2018).
It was assigned to Asterinidae by Sladen (1889), Hess (1972) and Smith and Tranter (1985); and to Chevronida by Gale (2018).
Subtaxa
Synonymy list
Year | Name and author |
---|---|
1889 | Tremasterinae Sladen p. 34 |
1972 | Tremasterinae Hess p. 22 |
1985 | Tremasterinae Smith and Tranter p. 352 |
2018 | Tremasteridae Gale p. 293 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Fm. Tremasteridae Sladen 1889
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G. †Mesotremaster Hess 1972
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†Mesotremaster felli Hess 1972
†Mesotremaster mazetieri Mercier 1935
†Mesotremaster zbindeni Hess 1981
Diagnosis
Reference | Diagnosis | |
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A.S. Gale 2018 | Abactinally domed Chevronida in which the adambulacrals are broad and short and the large actinal interareas are constructed of numerous rows of small actinal ossicles, each running from the adradial margin of the adambulacral to the margin. |
Measurements
No measurements are available
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Source: o = order, c = class, p = phylum | |||||
References: Aberhan 1992, Aberhan et al. 2004, Blake 1990 |
Age range: base of the Late/Upper Bajocian to the top of the Late/Upper Bathonian or 171.60000 to 164.70000 Ma
Collections (2 total)
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Late/Upper Bajocian | Switzerland | Mesotremaster felli (32036) | |
Late/Upper Bathonian | France | Stauraster mazetieri (72284) |